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The investigation plunges Hiro and Father Mateo into the dangerous waters of Kyoto's floating world, where they learn that everyone from the elusive teahouse owner to the dead man's dishonored brother has a motive to keep the samurai's death a mystery. A rare murder weapon favored by ninja assassins, a female samurai warrior, and a hidden affair leave Hiro with too many suspects and far too little time. 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